To be more specific, if the nickel plating is present on the bottom of
the portion that peeled off, the problem is improper cleaning prior to
nickel plating (the copper oxidized). If there is no evidence of nickel
on the bottom of the flake, then what you have is a plating skip. Either
way, SCAR the board vendor.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Barmuta, Mike
Sent: Friday, October 28, 2005 10:58 AM
To: [log in to unmask]
Subject: Re: [TN] Gold Plating Peeling...
Steve: It looks like it's actually the nickel coming off the copper.
The short answer is, if the gold in on the fingers in the mating contact
area your are OK. I would run some solder across the exposed copper and
call it good.
If the gold is missing in the mating contact area of the fingers you
need to clean/prep/brush plate Ni followed by Au.
The more critical issue is the plating integrity. You should do a tape
test on all exposed Au. You may find additional peeling that is
unacceptable.
Get back to the board fabricator, this is coming from them. Usually an
indication of problems in resist and/or Ni-Au plating processes.
Reagrds
Michael Barmuta
Staff Engineer
Fluke Corp.
Everett WA
425-446-6076
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, October 28, 2005 8:37 AM
To: [log in to unmask]
Subject: [TN] Gold Plating Peeling...
Well, I just got back from "Sin City", and as they say; "no rest for the
wicked".
I really wasn't that wicked, but I was confronted with a new problem
this morning.
We just built some assemblies and conformal coated them, but when they
were being de-masked, the gold plating on the fingers started peeling
up! Check
out:
http://www.stevezeva.homestead.com/files/Peeling_Plating.jpg
http://www.stevezeva.homestead.com/files/Peeling_Plating_2.jpg
I have a couple of questions:
Can I repair this?
If I repair this, should all fingers be stripped and repaired?
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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